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71640

Sigma-Aldrich

Sodium phosphate dibasic

puriss. p.a., ACS reagent, anhydrous, ≥99.0% (T)

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Synonym(s):
sec-Sodium phosphate, Disodium hydrogen phosphate, Disodium phosphate, Sodium hydrogenphosphate
Linear Formula:
Na2HPO4
CAS Number:
Molecular Weight:
141.96
EC Number:
MDL number:
eCl@ss:
38070211
PubChem Substance ID:
NACRES:
NA.21

grade

ACS reagent
puriss. p.a.

Assay

≥99.0% (T)

form

powder (or crystals)

impurities

≤0.001% total nitrogen (N)

loss

≤0.2% loss on drying, 105 °C

pH

8.7-9.3 (25 °C, 50 mg/mL in H2O)

pKa (25 °C)

(1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)

anion traces

chloride (Cl-): ≤10 mg/kg
sulfate (SO42-): ≤50 mg/kg

cation traces

Ca: ≤10 mg/kg
Cd: ≤5 mg/kg
Co: ≤5 mg/kg
Cr: ≤5 mg/kg
Cu: ≤5 mg/kg
Fe: ≤5 mg/kg
K: ≤50 mg/kg
Mg: ≤5 mg/kg
Mn: ≤5 mg/kg
Ni: ≤5 mg/kg
Pb: ≤5 mg/kg
Zn: ≤5 mg/kg
heavy metals: ≤0.001% (by ICP-OES)

SMILES string

[Na+].[Na+].[H]OP([O-])([O-])=O

InChI

1S/2Na.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+1;/p-2

InChI key

BNIILDVGGAEEIG-UHFFFAOYSA-L

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This Item
S326471642S0876
Sodium phosphate dibasic puriss. p.a., ACS reagent, anhydrous, ≥99.0% (T)

Sigma-Aldrich

71640

Sodium phosphate dibasic

Essential Grade
Sodium phosphate dibasic for molecular biology, ≥98.5% (titration)

Sigma-Aldrich

S3264

Sodium phosphate dibasic

-
Sodium phosphate dibasic purum p.a., anhydrous, ≥98.0% (T)

Sigma-Aldrich

71642

Sodium phosphate dibasic

-
Sodium phosphate dibasic ReagentPlus®, ≥99.0%

Sigma-Aldrich

S0876

Sodium phosphate dibasic

-
assay

≥99.0% (T)

assay

≥98.5% (titration)

assay

≥98.0% (T)

assay

≥99.0%

form

powder (or crystals)

form

powder

form

powder

form

powder or crystals

impurities

≤0.001% total nitrogen (N)

impurities

-

impurities

-

impurities

-

pH

8.7-9.3 (25 °C, 50 mg/mL in H2O)

pH

8.9-9.2 (25 °C, 50 g/L in water)

pH

8.8-9.4 (25 °C, 50 mg/mL in H2O)

pH

8.9-9.2 (25 °C, 50 g/L in water)

anion traces

chloride (Cl-): ≤10 mg/kg, sulfate (SO42-): ≤50 mg/kg

anion traces

chloride (Cl-): ≤40 ppm

anion traces

chloride (Cl-): ≤50 mg/kg, sulfate (SO42-): ≤1000 mg/kg

anion traces

-

General description

Sodium phosphate dibasic is a sodium salt of phosphoric acid. It is highly hygroscopic and water-soluble compound used as a texturizer, emulsifier, and buffer. It can also be used as a reagent in water softeners, cleaners, and boiler treatments process.
Sodium phosphate is widely used buffer in molecular biology, biochemistry, and chromatographic studies. It exists in three forms: monobasic (NaH2PO4), dibasic (Na2HPO4), and tribasic (Na3PO4). Monobasic and dibasic forms in varying ratios are commonly used to compose the neutral sodium phosphate buffer solution.

Application

Sodium phosphate dibasic can be used:
  • As an efficient and low-cost catalyst for the synthesis of 2-aminochrome by the reaction between aromatic aldehyde, malononitrile, and α- or β-naphthol under solvent-free conditions.
  • As a buffer in the synthesis of cyclic, acyclic enones and α, β-unsaturated aldehydes from trimethylsilyl enol ethers by using palladium as a catalyst and oxone as oxidant.
  • As an efficient catalyst in the synthesis of 3,4-dihydropyrano[3,2-c] chromenes from aldehydes, malononitrile and 4-hydroxycoumarin.
  • As a phosphorous precursor with the phosphoric acid in the synthesis of hydroxyapatite by precipitation method using anionic surfactant SDS (sodium dodefcyl sulfate).

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


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